To install downloads from TSR, all you have to do is save the sims3pack file to your sims 3 download folder (documents> electronic arts> the sims 3> downloads) and the files will show up in the downloads tab of the game launcher next time you run it. Then all you need to do is select and install them.

There are lots of sites that host free hair downloads, but for most of them you need to be able to install package files, so before you try downloading from any of the following sites, have a look at my simple guide to installing the files so you’ll be able to use them: